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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59b465db05d306e0ccd8050cc63a72950ff75e66e6f0641c030fa46dd881c251' 
  AND token = '4LaV39SfPW6S02r8ABPbjEQBPrZrPdF7T48WF5AJfZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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