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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f3e1888a82ff9c6177a750dbf8a1bbce62783cf1dc4ccc4725a8df9fb60ae75' 
  AND token = '6cfKYNGWd5op4gmBR3AMg5FDs5lB0SgFBM9ATI1AZNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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