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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9306cf77dee380078de95efb5e9400f9e8cc83d948c0dc06a6591b31cfcbe302' 
  AND token = '2TjRyuMnZHDNi8PgRW82bU6dFpGG297XrXf6wRYPU7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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