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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b68185b0a6778163976805de400f10bfdbf48f126a102d38e155fa53721ddb' 
  AND token = 'HJLIkGUHZFYXDbGHbsXHnXygJZn5PsGN1CXs1PxNeNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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