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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68dbdb1ea23cc6d430243bb51a6dd6f5f2ca5f9ab152962d2985997beaa97475' 
  AND token = 'ydL4OUsTWLtkj02qgTYywBFAs8d9EEWha3IsfS6ojQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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