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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9223a9e40cdf3215ee2216764eb3aa2bcd1ccb4ea2922879b2393a45033b624b' 
  AND token = 'sEdnL6tmy5qfgZPCjvHIJuyfa8/hQQ7fl3KzJLOW1o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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