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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc008412e2b7e81a42e83076c56f00b2316e281ce48dbca95691fc0a4cdd8b6' 
  AND token = 'lqZ2hBq4iftmt6EoRteP4xlE4gPa2P/MH01BwFofQVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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