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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0063c4b9bb736e770264f9422df1004c0e1874292a4b2acc0b222d263ff9acb3' 
  AND token = 'X3RRC1vR6Tc9q9j5POkmwmpbg9h611FKTTYqPVa1TfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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