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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ddb204b374845550882deebb045cfbb6990d59e1fe90c8f2d6312c8244388e2' 
  AND token = 'GT/qiY5yEThLQKo9Z91ffI6TABXFTCVT6TCu7vCSK5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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