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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '394dda6044a6f9c0be04d5f4ad31b32e104ca874de28c2e59b4fc3a75ca30cf4' 
  AND token = 'QogYREmRGdRv/Fs2cNNRUFgZc6qjeQXbqyYg5uTJRcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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