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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e56b4fe0f4fc4d0d405c9f11061c6f7a165f39cd6e20f97ec7015aa21d1ee7' 
  AND token = 'AfNRLhs/vqwA6oKNyPKMMfN/li4IrKusKgY8UcE1NZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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