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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266f77e94e157883f5808d6ed021f691e5f86b380488c6831c12e3eb3db5ab48' 
  AND token = 'tLqWR6Y+E3lA/luFWXbKeQX9xg5q69xuKyuknu8enEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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