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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8284b7bc96219b0c44c4d62e9a99510fef7e3ef118f1f4c1d67a93e3da2804ba' 
  AND token = 'L+8v41qr1/tsddueAsFJHcqQCDI18ko38H8MLPOGkm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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