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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8827d4028ebc67f95a0bb9d401f2febb399bfb06de766d699d8bd1ed5187c07' 
  AND token = 'SzZqRwoQKh3bFSUbJRPJ2snsgamM6cTt7VBRF7pkcao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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