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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec0fe1a6ab99be58bbf3db16133db04d0824fd38b45f19c2e22800eaa318bbd1' 
  AND token = 'QQKk1FhzWbF4Jp/7clm/fdZ4dDHRivFUzELa2d2rWMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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