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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a12064db78ebed7076a8ebad46bea0c10526e758488bb8a816485759831f02' 
  AND token = 'ZFn20osk8Wf/r/bFBqV3KWgz3ZmTLZpUcAQZk3H5VMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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