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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aed8de2aef28b98bbff2f6945bbc14d0aa85b24d46b53d9ebb55a0d9703b144' 
  AND token = '3BH14W2FCDZaUtXWZfw9Hum+p16IX2mYtRqqhWc32i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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