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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c6b92431b40884616cd755ca37a71891ff5096e251a0d6e677b3034543c8e2' 
  AND token = 'xO4RtZRolkvi8dxr/0dAOgUSRQX/isqqa31Dcd4WSpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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