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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8029b003fec346815052b57eb217d17f0c35c6f45538090cad49a0334b534a' 
  AND token = '5P/XwVwUnhKgPtNaONn3sf5QiPTXav9CIxppheewE40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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