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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a109b9c8ac8e985fd5f7a4f53529f5e880f6c900ca11817e85ff04f97c6dd1be' 
  AND token = 'TUyTAP+JKu71s59pZzeup+MGEgpLrvcD8f5jTovtyTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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