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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a15e6218618eb562a0eac72903b28b50048d23485b41ada7e1411afc93fb642' 
  AND token = 'JvHV8Y6y5nyYfHANXFQmHlZ3DHSHt88FqjJ41cwXyHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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