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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc713d08e048aace359e69312a84d10724984ee707659dfa68b292ff2c5be9d' 
  AND token = 'IbIjnFCyE/AvIofPv4jX+YUXUTrBWFeltYeRU86ERzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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