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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a103a28ad67f06d77bce3634f27bca7ea3cca1b1b34d2ff745c756a9b63a83c' 
  AND token = 'e0lFDbg+ruzrMh0oST/kns4xfL10nOQD+xIOxtGsRw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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