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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e89d03c4b02d8e319a3663e50b4c1965328d6c68a775459cc3df2cffa478654' 
  AND token = '8dcExTaahipCbNMHRcpxmUuLr0d73P0RhDx/exsT+yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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