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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc309f1f7fa8992d2f8c3dc4f09eb23aa581718ae0203032ed3800df22c37084' 
  AND token = 'haeWmx47ysWbWYHmq4lp5105JT5K5ErBLRJnKbkpZBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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