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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f07f28ed8ed23a4c38dc5cd3305f85d746e605e964b90438660005ace5f1a3a' 
  AND token = 'jZhtiaoOWT5CrmES2LoV+swpaMb3F6jTmUipmvAXCGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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