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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f7ba1b08a25a9bfeb48afd2c528407390f55a70943f45140e2c237e5202e1b4' 
  AND token = 'i3A3nikQcpE0rGTUSLIKdreJpBDgBbNskTXy3szvYE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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