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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b655121115d3192bffef39adeed9b087e4d1b86b3ecfb63fbe01ec16393c4862' 
  AND token = 'TQ24aE5ss/kYlilxQgq50zJCJrWEoJFY8HFw/jRQRp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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