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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902bbe7729feba4e0617a24dd2a551836ac0972fe876d793e646ed623be21019' 
  AND token = '04OZYX2+kIcEiRfQhyTxV932Uiwt9xgd8ajPQ+jxmG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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