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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a163ec3228556c700d614cab0d814213d367106a0f8b6fd7ff95e5d6543ea3' 
  AND token = 'u1j5yGuW5jPjXq6R66iaFglYfsC+fxD3wBK5IQK4vSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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