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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c87c919d979b7202f2ed4a880f33651502242e71a7e403a4cb984579e7088b' 
  AND token = 'gDPv+JEaNpkKWL5irkz3Y/gM6IYc8Ht0D9H0QOmiGJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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