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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc18cfcd51a76ff995ba33c583c1eeb50db036ce7266148909d8c927daa09f0' 
  AND token = 'aknzvuU6zxxu31bca7j/UQNeJc9vxetSTFs9UwpMc7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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