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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92839fcf4882b3a2a0588546d36eeb5b075c8a448fc70610cd188b2e174a15f3' 
  AND token = '3XLjgljGIoglapYDqRw7hOM+9bYWEN0forOnjE96spw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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