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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74161f1b751c5535246861e3d08ad46cf088caa5edc0bd60642e3dd63fd8f670' 
  AND token = 'l3y2btGzJj8PC7M6Z7FHPnwMH0G8srzl3RdHgpaQ9Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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