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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d55fc7d93d1183026673189dc735db446ca71e0037da27138f9186a36f29ef4' 
  AND token = 'G5lZfP/428CcEv+KygZFkF8CWI1CgoESChOcThLZeFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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