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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15adac637c069da02241b3c9eaf8670a97676389f016f700ae6597b4aeae5175' 
  AND token = 'hb9AOMsea9p/7jG1VAGwixM/lFiM+HvDg2KsMJMp3Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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