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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edbf40be7ba6aad91891e3974cec224f65f8644b534776885488ed6b55d9bab4' 
  AND token = 'durNpk/8dJ+OHU7lRzGLuxlLiAcqmKBHUlSGPs+6Rs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}