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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0392830f30afa1a24a2fcd7d7973e48082ebb294235bebaa664daf616359272e' 
  AND token = 'uGO99fqyhycPZTtfwYcQq53mlQ2k1g4VSmB4GaNCCVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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