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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5f01a2cf469b17d4b034d5c3acf5556184cdea357ffe8608605bb20e161834a' 
  AND token = '98gpIc69U2pWWWl2hfU/Sa/tTipVgK/4ltRsuEjO0A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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