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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd47e6e29ec9fe0966d78e81502463d3b17c1fd8d80b403be79b67a3fc246509b' 
  AND token = '5fPlX3B3K+77riTL9moexfDqzLDXLbTs2e2LmrNlSgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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