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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e0337c86a8fd5d00089a8a67de44ad3ce58519734ec5495a0ef0f0fa84bddb' 
  AND token = '2QgnZlTEBU2CUXOhmn+7dapiM58d7P7xv9bQojcH0WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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