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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee242b1743ee8ff776ec119736cb788958e08349a0863d1dd4e6537f07fff0e' 
  AND token = '/iA4/5zPrzT75c9iUVzV2FADfiUEOl0rsr6b12+hvXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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