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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30cc265cb0ed48b5d818feaae1f79d18624964d4721d7eb53e44e783175c1f1c' 
  AND token = '/YV7d0JfbucUsA5vmyDdgGw7AugB75aug7DzlBqxglM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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