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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47959b7f54dace0e6af8bb9595477695b60792d05c06bf22fcc0a52f96954873' 
  AND token = '51FeBuQTXbB9rhNqXyRliDszEyfN8hRD8Vpa2xexFq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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