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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdfed7b596ae61d2630689ad19f243eda026c63729480d07c3e5d3c4c8e5bc76' 
  AND token = 'KGb0DJoFp9XqcpawkPP9LPlN0WXVKKUCA9B1s5REDyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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