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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18fa6e60bee8534f2c7e0dade798370f5ec9d0429eef67a04d5c6f8c0fedefe9' 
  AND token = 'J3oFNLpNIcx0iBrupxy3ej+Kkol1h3xobTUh3GJXFrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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