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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ae97c15a35eae2ff043105be7280a347332eabe2f6ef97624a9fe107a853df' 
  AND token = 'SBphSZp9kW/fEzitydFs7aMaGyiiZpec5PNzkBuyhgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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