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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8adcd938284db37cfdb4e113eee17542449e396af6a04773f2cfb84cbf72cad1' 
  AND token = 'pov0i5CHLFTi44QdHdMa8kA+lfnFqDzKpTi2IsiAaiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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