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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86a7f4946a7bc4e1cb575dc3844f380aa4acbea9637a08aaf304e892b23137c' 
  AND token = 'OU69Ox+4LP+mejYh5UPNbtBc7Beeyq/BaF9QhtNNSZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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