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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd582b66dd43815d245f68f65be9d0a4ee2e88c6bea3a6cec5b13ad1ad500de' 
  AND token = 'aQwa3wpsm2mV0IWnAk7J/mRQXpkVZCkA0vw9f8WoyKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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