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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68a4aa9df2f2d50aadbe3e00b6b163fc0cdb416101aea154a38cc9c230bcca6' 
  AND token = 'h/0XKpc8avJl/63SIU283S+MyIR2X+1kcf9xAQwDu10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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