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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63392afcc2e74cb21f8f749b25004c3afeb5e1a1a4c80e921f0ecfdf48cfab2b' 
  AND token = 'yJsk6y0kocHQrQl8/1RcHb/qMYWMhA+UWxyHhSOJbEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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