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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70c9f9eac5874f227ead11fcd95eebf41625f636a7ae00bafda4f62a77fdcfa' 
  AND token = 'dym45aa93tOYVes5JiIlUDhllIogAK1B1oNZTBNBwNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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