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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef3147b5f6226e7908c94eac2dcc484a261d87c5c621f6605cee013b7d23a47' 
  AND token = 'FMcOdlydB4PoBPoh+RojJcx7ka5xLcSTG1nxnIpU/og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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