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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2956a2a5fdad744a36c72b5f4e5bfd161719ef16de2a8559634d629688b92d' 
  AND token = '790FAT2gwBFgyKT1WaKrF5wrlUwNrb0gcUcCqOs5Zww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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