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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c63915abedb03cfafd3ef585f02ee9a7c24c5f3fb5faf0425d44651db4246ab' 
  AND token = 'BYrz0fSEMjIeY8zGKnq/412jb7vQQ4+8rrTX5OF8OHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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