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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78220f8065316120b11b252c62d6c3ca2684e6d9bc9d6ae0e7f018c3867c9a9c' 
  AND token = 'GmozdiokjGfp8dZQyoy7nrOhL6SbN2EaShqRcXIl5aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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