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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '502d79020c216a0aa9193a35ba4ff38ed0f28187c2ad1be9cf8ab4b56b5aec8e' 
  AND token = 'TLfw+Hk6g/7rp5GwqDM/fe2xUFQzk2e20Knf9ceBO5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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