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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71dddd8d1b505fc790ae99b674f1b8eea91b986290dfa8b33fb7128a3c064314' 
  AND token = 'S3mx8wDS7iOocRIuuahkurqzcc79ZgttqkVpJV9i7ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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