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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0601c817e9a52e8e83ab1d5cb0f18d6663bc69ceacbf021e97355cb8a7eb3a6' 
  AND token = 'IHgfEeVZay4PZcxQjVvgYwxhspg9WoB/q59+wVTTTl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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