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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e271050fddff5a553e340bb7112009068309d3210383b10615b456613e7807' 
  AND token = '1ZrYjQo42L3hh3b6IfZ02/ETD2xxLGBeVB7t7qh10yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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