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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e0799e920537f68382ccc146fe75b54e114ecf5e4ce6bfc5e0a3caf5b828a56' 
  AND token = '9Yh/ltJiP2J7cjzFkhRaViJR788rtDUoJB3mfXRL22k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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