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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b6da24e959c620487332d73da967320f355b38a5c0db5ebb8dc7fae3cd77590' 
  AND token = 'cp5/Onfj/waUvlR/mepgacMMSuxX9qHX1r3Y0OJWmxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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