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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '129168221fa339c1715aaf8ee346ae1da414e204385124f7343a4614a8371e71' 
  AND token = 'glDZ95cV3AJtBJZt1Q5jJrlE19Hzjvk0SB5NaMhQAhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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