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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b273003e7d621b9ad4ccc7cc402ea9c3b9bf6210c43e5b7fd79d70709da09095' 
  AND token = 'osQGwSb9zwLfs5FdonffZQaezi92yigkdz5VMCTTT54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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