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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6831d00f07b3d10573eb5c3c0863d20765fde659e5623e028d3ff442b3a2e4' 
  AND token = 'Jc3rO1M7neZQhIO9CQ/ebwqlmEbY7J3bod9Ty0v7P3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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