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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847c0e55de87ebd6b8c3b0f1c751b1b27da25853e15aec1a36171163432cd085' 
  AND token = 'BlXHPHb1QZTc31urvcD8KC6FE9OP2K3XojMx6pPYo4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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