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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b030e41b104e5510ff711de6d0325502f3b19af172d1d5bc668608b974f6d3' 
  AND token = 'BifwbLn1zZZC9IlKp7X0BWirlfzzmjTk0FYlu5HdgCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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