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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f52e6e3fd883bf01f52feb2832647cc1838d18e16df7b973ea85c619c7893926' 
  AND token = 'Er8SPE5h8LkOPDsGIL7Tv0GRit1qeGuXFZc7scNE/hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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